class Liquid::Template
Templates are central to liquid. Interpretating templates is a two step process. First you compile the source code you got. During compile time some extensive error checking is performed. your code should expect to get some SyntaxErrors.
After you have a compiled template you can then render
it. You can use a compiled template over and over again and keep it cached.
Example:
template = Liquid::Template.parse(source) template.render('user_name' => 'bob')
Attributes
Sets how strict the parser should be. :lax acts like liquid 2.5 and silently ignores malformed tags in most cases. :warn is the default and will give deprecation warnings when invalid syntax is used. :strict will enforce correct syntax.
Public Class Methods
# File lib/liquid/template.rb, line 101 def initialize @rethrow_errors = false @resource_limits = ResourceLimits.new(Template.default_resource_limits) end
creates a new Template
object from liquid source code To enable profiling, pass in profile: true
as an option. See Liquid::Profiler
for more information
# File lib/liquid/template.rb, line 96 def parse(source, options = {}) new.parse(source, options) end
Pass a module with filter methods which should be available to all liquid views. Good for registering the standard library
# File lib/liquid/template.rb, line 85 def register_filter(mod) StrainerFactory.add_global_filter(mod) end
# File lib/liquid/template.rb, line 79 def register_tag(name, klass) tags[name.to_s] = klass end
Public Instance Methods
# File lib/liquid/template.rb, line 119 def assigns @assigns ||= {} end
# File lib/liquid/template.rb, line 127 def errors @errors ||= [] end
# File lib/liquid/template.rb, line 123 def instance_assigns @instance_assigns ||= {} end
Parse source code. Returns self for easy chaining
# File lib/liquid/template.rb, line 108 def parse(source, options = {}) parse_context = configure_options(options) tokenizer = parse_context.new_tokenizer(source, start_line_number: @line_numbers && 1) @root = Document.parse(tokenizer, parse_context) self end
# File lib/liquid/template.rb, line 115 def registers @registers ||= {} end
Render
takes a hash with local variables.
if you use the same filters over and over again consider registering them globally with Template.register_filter
if profiling was enabled in Template#parse
then the resulting profiling information will be available via Template#profiler
Following options can be passed:
* <tt>filters</tt> : array with local filters * <tt>registers</tt> : hash with register variables. Those can be accessed from filters and tags and might be useful to integrate liquid more with its host application
# File lib/liquid/template.rb, line 145 def render(*args) return '' if @root.nil? context = case args.first when Liquid::Context c = args.shift if @rethrow_errors c.exception_renderer = Liquid::RAISE_EXCEPTION_LAMBDA end c when Liquid::Drop drop = args.shift drop.context = Context.new([drop, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits) when Hash Context.new([args.shift, assigns], instance_assigns, registers, @rethrow_errors, @resource_limits) when nil Context.new(assigns, instance_assigns, registers, @rethrow_errors, @resource_limits) else raise ArgumentError, "Expected Hash or Liquid::Context as parameter" end output = nil context_register = context.registers.is_a?(StaticRegisters) ? context.registers.static : context.registers case args.last when Hash options = args.pop output = options[:output] if options[:output] options[:registers]&.each do |key, register| context_register[key] = register end apply_options_to_context(context, options) when Module, Array context.add_filters(args.pop) end # Retrying a render resets resource usage context.resource_limits.reset if @profiling && context.profiler.nil? @profiler = context.profiler = Liquid::Profiler.new end begin # render the nodelist. @root.render_to_output_buffer(context, output || +'') rescue Liquid::MemoryError => e context.handle_error(e) ensure @errors = context.errors end end
# File lib/liquid/template.rb, line 203 def render!(*args) @rethrow_errors = true render(*args) end
# File lib/liquid/template.rb, line 208 def render_to_output_buffer(context, output) render(context, output: output) end
Private Instance Methods
# File lib/liquid/template.rb, line 227 def apply_options_to_context(context, options) context.add_filters(options[:filters]) if options[:filters] context.global_filter = options[:global_filter] if options[:global_filter] context.exception_renderer = options[:exception_renderer] if options[:exception_renderer] context.strict_variables = options[:strict_variables] if options[:strict_variables] context.strict_filters = options[:strict_filters] if options[:strict_filters] end
# File lib/liquid/template.rb, line 214 def configure_options(options) if (profiling = options[:profile]) raise "Profiler not loaded, require 'liquid/profiler' first" unless defined?(Liquid::Profiler) end @options = options @profiling = profiling @line_numbers = options[:line_numbers] || @profiling parse_context = options.is_a?(ParseContext) ? options : ParseContext.new(options) @warnings = parse_context.warnings parse_context end